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  1. Home
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  3. H12-261_V3.0

Huawei H12-261_V3.0 Exam (page: 18)
Huawei HCIE-Routing & Switching (Written) V3.0 Exam
Updated on: 15-Feb-2026

Viewing Page 18 of 97
H12-261_V3.0 PDF 479 Questions

As shown in the following topology, EBGP is run between AS100, AS200, AS300, and AS400, and the neighbor relationship has been established.
When AS400 receives the BGP route of the network segment 1.1.1.1/32 sent by AS100, the correct order of the paths recorded in the AS Path attribute is:
?

  1. 100, 200, 300
  2. 400, 300, 200, 100
  3. 100, 200, 300, 400
  4. 300, 200, 100

Answer(s): D

Explanation:

The AS path (AS_PATH) attribute is recognized as a mandatory attribute. This attribute field indicates which AS paths the routing update information passes through. It is used to ensure that there are no loops between ASs. AS_PATHThe attribute records all the AS numbers that a route passes through from the local to the destination address in a certain order.
When BGP advertises a route to other ASs, it adds the local AS number to the top of the AS_PATH list. The BGP router that receives the route can know the AS to go through to get to the destination address according to the AS_PATH attribute. The adjacent AS numbers closest to the local AS are listed first, and the other AS numbers are listed in order.



Which of the following descriptions about OSPF virtual links is correct?

  1. A virtual connection can be established in any area, and it also belongs to the area after establishment
  2. The virtual link uses the IP of the outgoing interface as the link address
  3. Virtual links can be used to solve the problem of zone 0 being divided
  4. cost of virtual connectionzero, is the optimal link

Answer(s): C



Which scenarios can use AS-path-filter?

  1. A carried by routeSPATH attribute to filter routes received from BGP neighbors. For example the command peer xxxx as-path-fliter import
  2. Route apply clause in policy
  3. A carried by routeSPATH attribute to filter routes sent to BGP neighbors. For example the command peer xxxx as-path-ilter export
  4. if-match clause in Route-policy

Answer(s): A,C,D

Explanation:

AS-path-filter is only used to match the as-path attribute, no action is taken. So B is wrong.



Which of the following descriptions about link-state routing protocols is correct without dividing areas?

  1. Each router establishes a topology of the entire flooding domain
  2. Each router learns routing entries directly from routing updates and adds them to the routing table
  3. Routers in a flood domain may receive the same link state information repeatedly
  4. Routers throughout the flood domain have the same link-state database
  5. The router will send all link state information from one neighbor to all other neighbors to ensure the synchronization of the database

Answer(s): A,C,D

Explanation:

The link-state routing protocol updates the link-state database and then performs routing calculations. So B is wrong.



As shown in the figure, R1, R2 and R3 run OSPP at the same time and announce their respective loopback ports. The following description is wrong.

  1. filter-policy can be used on R2 expoThe rt command filters the loopback route of R3
  2. R2 can be used in Area use filter in 0r import command to filter the loopback route of R3
  3. filter-policy can be used on R1 import filters the loopback route of R3
  4. Area is available on R2 Use filter in 1r expot command to filterR3 loopback route

Answer(s): A

Explanation:

The loopback route of R3 is not generated by R2, so it cannot be filtered by export.



Viewing Page 18 of 97



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